Ten million square miles of coastal lands disappeared nearly overnight, and ancient texts bear witness to the event around the world. The oldest such account was preserved on clay tablets by the ancient Sumerians, six thousand years ago. It's eerily similar to Noah's flood story.
Yup.
A cometary impact in North America.
It wiped out, finally, the American rhino and the mastodon.
Go to Alaska and dig for gold. You might not find much gold, but you will find hoards of unarticulated bones, from hundreds of species, many broken and shattered,
Boatloads of bones.
Testimony of the catastrophe.
Concur. I believe the theory, well supported I think, that a fragmenting comet or asteroid hit the northern ice cap at the end of the last ice age, about 12,500 years ago. The result was the great flood and the intense Younger Dryas Ice Age. We were lucky to survive as a species.
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It was 4500 years ago.
The universe and time itself were created 6000 years ago.
I've heard that before, as well as that there is evidence at both the North and South poles of a huge surge in water levels at about the same time, indicating that a great flood happened somewhere in this time.
OTOH, some Old Earthers have claimed that this isn't the flood of Noah, but Earth in its water-covered state at Genesis 1:2, immediately following the fall of Lucifer a mass extinction took place and wiped everything out.
Not saying that that's true, but there's all sorts of weird mysteries from Earth's past that make for fascinating discussion...